Ok Stimmer I see now but I'm confused, in other threads there were issues with USB routines, are there just on native USB ?
As i've reported when moving an arduino MEGA code to arduino DUE, the USB link between Java running on my MacBook air and DUE would never work, in that case i was using USB programing port.
Maybe it would help someone makes clear thread on USB programming port and USB native port, different type of issues, have they been solved in new IDE...
I'm lost now :~